<?php
class BankAccount
{
	protected $balance = 0;
	
	public function getBalance()
	{
		return $this->balance;
	}
	
	protected function setBalance($balance)
	{
		if($balance >= 0)
			$this->balance = $balance;
	}

	public function depositMoney($balance)
	{
		$this->setBalance($this->getBalance() + $balance);
		return $this->getBalance();
	}
	
	public function withdrawMoney($balance)
	{
		$this->setBalance($this->getBalance() - $balance);
		return $this->getBalance();
	}
}
?>


















